VoIP-SIP Security Drop of QoS Performance by reusing RTP’s SSRC

This attack uses a pre-existing SSRC (synchronisation source) to cause a drop in the QoS (Quality of Service). 
The attacker must first know the SSRC used by an RTP communication by listening to network traffic. The attacker must then create RTP packets using the same SSRC to create collisions, and therefore create a loss in QoS.
The attacker must be able to listen to network and extract RTP packets to get the SSRC.
Read More:http://www.vadese.org/files/upload/Best_practices_VoIP_en_v20.pdf

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